Microstructure of Nd-Ba-Cu-O superconductors prepared by the oxygen-controlled-melt-growth method

P. Diko, H. Kojo, M. Murakami

研究成果: Article査読

14 被引用数 (Scopus)

抄録

Microstructure, analyses by polarized light microscopy show that Nd4Ba2Cu2O10 (Nd422) particles in oxygen-controlled-melt-grown NdBaCuO bulk superconductors have similar influence on the NdBa2Cu3O7-x (Nd123) microstructure as Y211 particles in the Y123-211 system. The twin spacing decreases with shortening of mean distance between Nd422 particles. The a-b microcracking in the 123 matrix was ascribed to thermal stresses around Nd422 particles set up in the matrix during cooling due to the different thermal expansion of Nd 123 and Nd422 phases. The relaxation of thermal stresses in the 〈100〉 directions by twin boundary motion was related to the observed rosette of detwinned regions or regions with predominance of one twin variant formed around Nd422 particles. The level of thermal stresses was estimated. The elongated c- and a-subgrains with rectangular cross section were shown to be a result of cellular growth, i.e. the subgrains in melt-processed REBaCuO (RE: rare earth) are growth related crystal defects.

本文言語English
ページ(範囲)185-196
ページ数12
ジャーナルPhysica C: Superconductivity and its applications
276
3-4
DOI
出版ステータスPublished - 1997 3月 15
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • エネルギー工学および電力技術
  • 電子工学および電気工学

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